I got 7 chicks from an ad on Craigslist - someone said they found an ameraucana hen in her husband's workshop with a brood of chicks this February. All 7 were hens, very broody hens that all disappeared and returned with clutches of chicks (one hatched 19 chicks!) So far not ONE of their chicks appears to be male, and of the banty eggs we slipped into their nests, we've only had 1 rooster hatch and the rest appear to be hens. So I'm getting really curious about whether there's something about the way these hens hatch their eggs that makes them come out all girls, like a temperature thing, like with lizards where one temp makes females and another temp makes males, or if there's some genetic disorder that makes them only make viable embryos that are female (there's one in humans for males and one for females), or if my dog, who hates roosters, is sniffing out the males and "offing them" before they mature. He's not allowed to kill chicks and is very careful around them when I watch tho he often tries to sneak up on them to sniff their butts. If it were a temperature thing then in a brooder you'd get 50/50 and under the hen I guess they might come out mostly males or mostly females. Anyone experience that? I'm just dying of curiosity! When I raised fish we found out about these self-cloning crayfish - someone had one in a tank and noticed it kept reproducing by itself, all females and that's how they were discovered. We got one and sure enough, having never been around a male at the right age she started laying eggs and hatched all females. They think it was a random mutation that someone just happened to notice. In the back of my head I'm wondering if I have mutant, Amazon hens, LOL!